41 Arietis

41 Arietis (abbreviated 41 Ari) is a triple star system in the northern constellation of Aries. With an apparent visual magnitude of 3.63,[2] this system is readily visible to the naked eye. It has an annual parallax shift of 19.69 mas,[1] which indicates it is at a distance of 166 light-years (51 parsecs) from the Sun.

41 Arietis
Location of 41 Arietis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  02h 49m 59.03324s[1]
Declination +27° 15′ 37.8260″[1]
Apparent magnitude (V) 3.63[2]
Characteristics
Spectral type B8 Vn[3]
U−B color index –0.38[2]
B−V color index –0.10[2]
Astrometry
Radial velocity (Rv)+4[4] km/s
Proper motion (μ) RA: +66.81[1] mas/yr
Dec.: –116.52[1] mas/yr
Parallax (π)19.69 ± 0.19[1] mas
Distance166 ± 2 ly
(50.8 ± 0.5 pc)
Details
Mass3.1±0.1[5] M☉
Luminosity160[6] L☉
Temperature11900[6] K
Rotational velocity (v sin i)175[7] km/s
Age130+10
−30[5] Myr
Other designations
Bharani, c Arietis, ADS 2159, BD+26 471, FK5 100, HD 17573, HIP 13209, HR 838, SAO 75596, WDS 02500+2716.[8]
Database references
SIMBADdata

The system consists of a binary pair,[9] designated 41 Arietis A, together with a third companion star, 41 Arietis D. (41 Arietis B and C form optical pairs with A, but are not physically related.[10]) The components of A are themselves designated 41 Arietis Aa (formally named Bharani /ˈbærəni/)[11] and Ab.

Nomenclature

41 Arietis is the system's Flamsteed designation. It does not possess a Greek-letter Bayer designation, since this system was once part of the now-obsolete constellation Musca Borealis, but is sometimes designated c Arietis. The designations of the two constituents as 41 Arietis A and D, and those of A's components - 41 Arietis Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[12]

In Hindu astronomy, Bharani (भरणी bharaṇī, Sanskrit pronunciation: [ˈbʱɐɽɐɳiː]) is the second nakshatra, or lunar mansion corresponding to 35, 39 and 41 Arietis. In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[14] It approved the name Bharani for the component 41 Arietis Aa on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[11]

In Chinese, 胃宿 (Wèi Su), meaning Stomach (asterism), refers to an asterism consisting of 41, 35 and 39 Arietis.[15] Consequently, the Chinese name for 41 Arietis itself is 胃宿三 (Wèi Su sān, English: the Third Star of Stomach.)[16]

In Avestan, the star was known as Upa-paoiri, and it was associated with one of the yazatas.[17]

Properties

The primary component is a B-type main sequence star with a stellar classification of B8 Vn.[3] The suffix 'n' indicates 'nebulous' absorption lines in the star's spectrum caused by the Doppler effect of rapid rotation. It has a projected rotational velocity of 175 km/s.[7] This is creating an equatorial bulge that is 12% larger than the star's polar radius.[18] It is a candidate member of the AB Doradus moving group[6] and has an orbiting companion at an angular separation of 0.3 arcseconds.[9]

gollark: Well, yes, because they wanted an anonymous network of some sort.
gollark: One would imagine they *run* a bunch of tor nodes.
gollark: Is it though? Is it really?
gollark: Nesting that much would also probably be hilariously slow.
gollark: I wonder just how much of the limited bandwidth available on the intercontinental fibre links is used up by triangles just pretending to be somewhere else so they can watch slightly different stuff on streaming services.

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
  4. Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  5. Janson, Markus; et al. (August 2011), "High-contrast Imaging Search for Planets and Brown Dwarfs around the Most Massive Stars in the Solar Neighborhood", The Astrophysical Journal, 736 (2): 89, arXiv:1105.2577, Bibcode:2011ApJ...736...89J, doi:10.1088/0004-637X/736/2/89.
  6. McCarthy, Kyle; White, Russel J. (June 2012), "The Sizes of the Nearest Young Stars", The Astronomical Journal, 143 (6): 134, arXiv:1201.6600, Bibcode:2012AJ....143..134M, doi:10.1088/0004-6256/143/6/134.
  7. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  8. "41 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  10. "Washington Double Star Catalog". United States Naval Observatory. Archived from the original on 2011-02-14. Retrieved 2 January 2018.
  11. "Naming Stars". IAU.org. Retrieved 16 December 2017.
  12. Hessman, F. V.; Dhillon, V. S.; Winget, D. E.; Schreiber, M. R.; Horne, K.; Marsh, T. R.; Guenther, E.; Schwope, A.; Heber, U. (2010). "On the naming convention used for multiple star systems and extrasolar planets". arXiv:1012.0707 [astro-ph.SR].
  13. "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  14. "WG Triennial Report (2015-2018) - Star Names" (PDF). p. 5. Retrieved 2018-07-14.
  15. (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  16. (in Chinese) 白羊座
  17. ANGELS:Zoroastrian
  18. van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2.
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